Your Digest for Saturday, Dec 30, 2023 09:59 AM


See [[passMedicine Summaries#Evaluation of gradual visual loss]]

visualFields.png

[!TIP] Mnemonic: RIFC: retina - ipsi, Field - contra

See also:

[!INFO] Retrochiasmal lesions will cause contralateral homonymous visual field defects.
According to the figure above, temporal lobe lesions will cause a contralateral superior quadrantonopia.
These are "Meyer's loop" lesions.


| Hyphema | Retinal detachment |

Evaluation of gradual visual loss

[!INFO] Visual loss means loss of one or more of

Pearls


Central Vs. Peripheral vision loss:


Speed of onset

Leading causes of blindness

Retinal vessel occlusion

bloodSupplyOftheEye.png
Source

Retinal artery occlusion (RAO) Retinal Venous occlusion (RVO)
Less common Much more common
Older population older population
Urgent need of further evaluation Doesn't need further evaluation for cause
Higher risk of ASCVD events
Managed by neurologist - like a stroke Managed by ophthalmologist
Permanent renal death in a few hours.
Commonest causes are emboli:
+ ICA emobli
+ aortic arch, cardiac
Sudden vision loss (curtain coming down) Vision loss ranges from slight to severe
Retinal haemorrhages are common
Vascular causes are the main risk factors Age seems to be the main risk factor
Source